Slide-valve.



A. NORGROVE.

SLIDE VALVE.

APPLICATION FILED SEPT-1.l9l7- 1 77,746. Patented Sept. 3, 1918 3 SHEETS-SHEET l.

ampws A. NORGROVE.

SLIDE VALVE.

APPLICATION FILED SEPT. 10. I917- Patented Sept. 3, 1918.

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$ r I Ms A; NORGROVE.

suoe VALVE; ICATION FILED SEPT- l Patentedsept. 3,1918.

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. d JS UNIT ALLEN noneaovn, or rnrivcn ALBERT, SASKATCHEWAN, CANADA.

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Specification of Letters Patent.

rammed Sept. 3, 1918.

Application filed September 10, 1917. Serial'No. 190,588.

To all whom it may concern:

Be it known that I, ALLEN NoRe ovE, a subject of the King of Great Britain, residing at Prince Albert, in the Province of Saskatchewan, in the Dominion of Canada, have invented certain new and useful Improvements in Slide-Valves, of which the following is a specification.

This invention relates to improvements in slide valves for steam engines and has for its object to provide a valve, for this purpose so designed that the sliding element of the valve is balanced by the steam pressure in all directions, whereby the tendency of the sliding element to bind against the walls of the valve, ,due to inequality of pressure on its various sides, is entirely removed. 1

' In carrying out my invention I provide a casing, in which the slide valve is adapted to reciprocate, so constructed that steam passing into the engine cylinder strikesthe slide on diametrically opposite sides, passes around a groove in the slide, and enters a chamber leading to the engine cylinder through diametrically opposite ports disposed at right angles to the first ports through which the steam is admitted to the In a similar manner exhaust steamslide. leaving the engine cylinder strikes against the slide on diametrically opposite sides, travels around the groove in the slide and leaves the groove through two diametrically at right angles to where the steam leaving the cylinder first strikes-the slide. Two such valves are provided on each cylinder of the engine. It will of course be understood that theslide in the valve is reciprocated by suitable mechanism connected withthe engine, this mechanism being well known in the'art and forming no part of the present invention. A

Bv reference to the accompanying drawings the nature of the invention may be more clearly apparent.

Figure 1 is a side view partly in section and partly in elevation of the valve in neutral position.

Fig. 2 is a section looking in the direction of the arrows on line 22 of Fig. 1.

Fig. 3 is a side view partly in elevation and partly in section but at; right angles to Fig. 1 showing the valve inintake position. Fig. 4 is a section in the direction of the arrows on line 44 of Fig. 3.

1 -Fig. 5 is a full.sectioirshowing the valve opposite ports in exhaust position, the section being taken from the'saine side of the valve as Fig. 1.

Fig. 6 is a'section on line 66 of Fig. 5.

In "the drawingsl is a valve casing provided at each end with plates 2. The casing is formed with'a central valve chamber 3 defined by wa'lls'4, preferably cast integral wlth the casing. Disposed one above the other and completely separated from each other by a partition 5 are two annular steam chambers 6 and 7.- The upper steam cham ber 6 communicates icy-means of passage 8.

withthe steam feed pipe 9. In the same horizontal plane, but directly opposite each other, are two ports 10 passing through the wall 4, permitting the passage of steam from the inlet steam chamber 6 to the valve chamber 3 (see Figs. 3 and In a similar mannor the lower steam jacket.7 connects with the exhaust pipell through passage 12, and

communicates with the valve chamber 3 by means of diametrically opposed ports13lyably directly beneath the ports 10 in'the inlet or live steam jacket The arrangement ing in the same horizontal plane and prefer of ports for the eXhauststeam jacket is in all respects similar to that of the inlet steam jacket. k I

Surrounding the jackets 6 and 7 is an annular chamber 14 communicating with one end of the engine cylinder through passage 15. Passing through the walls ofthe acket 6, in the same horizontal plane as inlet ports 10, are diametrically opposite ports '16";connecting'the annular chamber 14 with the valve chamber 3. The ports 16 are so placed that their center line is disposed at' right angles to the center line of the ports 10 '(see Fig. 4). Directly beneath theports 16 is a similar pair of-oppositely positioned'ports 17 connecting the chamber 14 with thevalve chamber 3, these ports being in the same horizontal plane as exhaust ports 13, but having their center line at right angles to the center line of the ports 13, the arrangement beingexactly similar to thearrangement shown in Fig.4 for the steam' inlet valve. The outer chamber 15-is not divided Sliding in the. valve' chamber '3 isa pis- 1:10 7

ton 18 provided on its circumference with an annular groove or duct 19. This duct is preferably made slightly narrower than the partition 5 and is adapted, upon reciprocation, to register with ports 10 and 16 and then with portsl3 and 17. The piston is reciprocated by a rod 20 passing through gland 21 on lower plate 2 and suitably connected with the valve operating mechanism on the engine in any manner well known in the art. The piston is preferably constructed with open ends in order that gases may pass freely from one end of the valve chamber to the other to avoid'compression of the gases in the valve chamber. In the drawings I have shown holes 22 passing lengthwise through the piston to prevent compression of the gases in the valve chamber.

In operation the live steam from plpe 9 passes, through passage 8 and fills the upper live steam chamber 6. When the piston 18 is moved inward to permit groove 19 to register with ports 10 and 16, as in F igs. 3 and 4, the steam passes through ports 10, impinging against opposite sides of the piston with equal pressure. The steam then travels around the groove 19 in both directions and out the diametrically opposite ports 16 exerting an equal pressure on the opposite sides of the piston (see Fig. 4). It will thus be seen that the valve is balanced both by the steam impinging against it and the thrust of the steam leaving the groove. From ports 16 the steam passes into the annular chamber 14 and then into the engine cylinder through passage 15. When the engine cylinder is exhausting the valve piston is moved to the position shown in Fig. 5, when the groove 19 registers with ports 13 and 17. The exhausted steam being pushed from the engine cylinder passes through passage 16 into chamber 14:. From chamber 14 it passes out the diametricallv opposite ports 17 into groove 19, the pres sure being equal upon each side of the piston 18. The steam then passes around the groove 19 in both directions and at the opposite ports 13 into the lower exhaust acket 7, and thence through passage 12 into the exhaust pipe 11. It will be seen that while the piston is in intake position ports 13 and 17 are closed by the main body of the piston and while the piston is in exhaust position the ports 10 and 16 are closed by the body of the piston. It will also be seen that when the ports are closed by the piston, the pressure of the steam in the ports against the pisto'nalways balances on diametrically opposite sides.

During one cycle of operation in one valve, a similar valve connected with the opposite end of the engine cylinder is operated in a similar manner but is reversed to feed steam to the engine cylinder while the first 1s exhausting, and woe versa.

I claim as my invention:

1. In a slide valve, a piston adapted to be balanced on diametrically opposite sides by incoming steam, and on diametrically opposite sides by outgoing steam, the outgoing steam moving at right angles to and in substantially the same plane as the incoming steam.

2., In a slide valve, a valve chamber having diametrically opposite inlet ports leading from a single chamber, outlet ports in substantially the same plane as said inlet ports for conducting steam from said valve chamber, and a piston adapted=to establish and destroy communication between said inlet and outlet.

3. In a slide valve, a valve chamber having diametrically opposite inlet ports leading from a single chamber, and diametrically opposite outlet ports in'the same plane as said inlet ports and disposed at right angles to said inlet ports.

4. In a slide valve, a valve chamber, a piston adapted to reciprocate in said valve chamber, a live steam chamber surrounding one half of said valve chamber and an exhaust steam chamber surrounding the other half of said valve chamber, an annular cylinder communicating chamber around said inlet and outlet chambers, ports being formed in said inlet, outlet and cylinder communicating chambers communicating with the sides of said valve chamber, and means on the periphery of said piston for establishing communication alternately be tween said inlet ports and cylinder communicating ports and said exhaust ports and cylinder communicating ports.

5. In a slide valve, a piston balanced through ports at one end by incoming and outgoing live steam pressure on diametrically opposite sides and through ports at the other end by incoming and outgoing exhaust steam pressure on diametrically opposite sides.

6. In a slide valve, a valve chamber, a piston in the valve chamber balanced at one end thereof by live steam pressure on diametrically opposite sides and by cylinder steam pressure on diametrically opposite sides, said cylinder pressure being at right angles to said live steam pressure, and at the other end by exhaust steam pressure on diametrically opposite sides and cylinder steam pressure on diametrically opposite sides, said cylinder steam pressure in the second mentioned end of the valve chamber being at right angles to said exhaust steam pressure.

7. In a slide valve, a valve chamber, a piston slidable in said chamber, an annular groove in said piston, diametrically opposite inlet ports in said valve chamber permit-ting steam to enter said groove and diametrically opposite ports at right angles to and in substantially the same plane with said inlet ports permitting steam to escape through said groove.

8. In a slide valve, a valve chamber, a piston in said valve chamber, a live steam chamber, an exhaust steam chamber, a cylinder communicating steam chamber, diametrically opposite ports in said inlet chamber communicating with said valve chamber, diametrically opposite ports leading from said exhaust chamber to said valve chamber, diametrically opposite ports leading from said cylinder communicating chamber to said valve chamber, said cylinder communicating ports being disposed at right angles to said inlet ports, two other diametrically opposite ports leading from said cylinder communicating chamber to said valve chamber said second-mentioned cylinder communicating ports being at right angles to said exhaust ports and means on said piston for alternately establishing communication between said diametrically opposite inlet ports and said first-mentioned diametrically opposite cylinder communicating ports and be- I tween said diametrically opposite exhaust ports and said second-mentioned diametrically opposite cylinder communicating ports and for simultaneously closing one set of ports While communication is established through the other.

9. In a slide valve, a valve chamber, a piston slidable in said valve chamber, diametrically opposite steam inlet ports at one end of the valve chamber, diametrically opposite cylinder communicating ports in the same plane as said inlet ports but disposed at right angles thereto, exhaust ports directly in alinement with said inlet ports but at the opposite end of said valve chamber, cylinder communicating ports in the same plane as said exhaust ports directly in alinement with said first-mentioned cylinder communicating ports but at the opposite end of said valve chamber, all of said ports leading into said valve chamber, and means on said piston adapted to close the ports in one plane while it establishes communication between the ports in the other plane.

10. In a slide valve, a valve chamber, a Wall surrounding said valve chamber and forming an annular chamber thereabout, a partition dividing said annular chamber into inlet and exhaust steam chambers, a cylinder communicating chamber surrounding said annular chamber, diametrically opposite ports in the side walls of said valve topics of this patent may be obtained for chamber on one side of the partition leading from the inlet chamber to the valvechamber, diametrically opposite ports in the same plane as the inlet ports but at right angles thereto leading from said valve chamber to said cylinder communicating chamber, diametricallv opposite ports in the side Walls of said valve chamber on the opposite side of said partition leading from the valve chamber to the exhaust chamber, diametrically opposite ports in the same plane as said exhaust ports leading from said cylinder communicating chamber to the valve chamber, and a piston in said valve chamber adapted to alternately establish and destroy communication between the ports on opposite sides of the partition.

11. In a slide valve, a valve chamber, a wall surrounding said valve chamber and forming an annular chamber thereabout, a partition dividing said annular chamber into inlet and exhaust steam chambers, a cylinder communicating chamber surrounding said annular chamber, diametrically opposite ports in the walls of said valve chamber on one side of the partition leading from said inlet chamber to said valve chamber, diametrically opposite ports in the same plane as said inlet ports but at right angles thereto leading from said valve chamber to the cylinder communicating chamber, diametrically opposite ports in the walls of said valve chamber on the opposite side of the partition leading from the valve chamber to said exhaust steam chamber, said exhaust ports being in alinement with said inlet ports, diametrically opposite ports in the same plane as the exhaust ports leading from the said cylinder communicating chamber to the valve chamber, said cylinder communicating ports being at right angles to said exhaust ports, and a piston in the valve chamber adapted to alternately establish communication between the ports in the same plane on one side of the partition while destroying communication between the ports on the other side of the partition.

12. In a slide valve, a valve chamber having a piston therein, said valve chamber being provided with diametrically opposite inlet ports and diametrically opposite outlet ports in the same plane as and at right angles to the inlet ports.

In testimony whereof, I have hereunto subscribed my name.

ALLEN NORGROVE.

five cents each, by addressing the "Commissioner of Iatents,

Washington, D. 0." 

